Electric modulation of the Fermi arc spin polarization of a Dirac semimetal nanowire

ORAL

Abstract

The spin polarization of the exotic topological surface states of Dirac/Weyl semimetals, namely Fermi arcs, were predicted to exist but never accessed in a simple transport structure. Here we report the direct access of the Fermi arc spin polarization through the electromagnetic transport experiment. The net spin polarization was manifested as a voltage of the ferromagnetic contact, which was induced by applying a charge current via spin momentum locking property of the Fermi arc in the Cd3As2 nanowire. Moreover, a gate voltage controlled topological phase transition of the surface states is demonstrated to be able to switch on/off the spin signals. Thus a topological field-effect transistor is proposed.

*This work was supported by National Key Research and Development Program of China (No. 2016YFA0300802), and NSFC (No. 11774004 and No. 61825401).

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Presenters

  • Benchuan Lin

    • Southern University of Science and Technology

Authors

  • Benchuan Lin

    • Southern University of Science and Technology

  • Shuo Wang

    • Southern University of Science and Technology

  • Anqi Wang

    • Peking Univ

  • Ke Xia

    • Southern University of Science and Technology
    • Beijing Normal University

  • Dapeng Yu

    • Southern University of Science and Technology of China
    • Southern University of Science and Technology
    • South University of Science and Technology of China
    • Shenzhen Key Laboratory of Quantum Science and Engineering, and Department of Physics, South University of Science and Technology

  • Zhi-Min Liao

    • Peking Univ
    • Peking University